Dell Latitude 9420 Service Manual page 5

LCD Power rail test (L-BIST)................................................................................................................................... 76
LCD Built-in Self Test (BIST)................................................................................................................................... 76
System diagnostic lights.................................................................................................................................................. 77
Recovering the operating system..................................................................................................................................78
Backup media and recovery options............................................................................................................................. 78
WiFi power cycle................................................................................................................................................................78
Drain residual flea power (perform hard reset)......................................................................................................... 79
Chapter 6: Getting help and contacting Dell................................................................................ 80
Contents 5